Fan blade



Feb. 13, 1923. 1,444,923

w. H. KEMPTON FAN BLADE Filed Dec. 2, 19,20

Patented Feb. 13,1923.

- 4 uuir rrss s .WILLARD H. KEMPTON, OF'WILKINSBURG,PENNSYLVAN1A,IASSIGNOR T wns'rme HOUSE ELECTRIC & MANUFACTURING COMPANY,A ooarorm'rron or PnNNsYL- VANIA.

. FAN BLADE.

I Application filed December 2,1920. Serial 1:10; 427,747;

To all whom it may concern: a hardened binder, such as a phenolic con-Be it known that 'I, WILLARD H. KEMP- densafion product, is placed in apunch press TON, a citizen of the U-nitedstates, and a provided with asuitable die, so that theaxis resident of VVilkinsburg, in the county of2 of the tube or section is-at an angle to the 5 Allegheny and State ofPennsylvania, have axis 3 of the die. By manipulating the die invented anew and useful Improvement in so that comes in contact with the,material Fan Blades, of which the following. is a .or tube 1, segmentsor fan blades 4 are specification. formed having their axes 3 at anangleto My invention relates to fan blades,- more the axis of said tubeor section. I I 10 especially to fan blades formed of com- 1 Inassembling the blades4on-ahub, their 'posite material such as wove-nfabric, paper axes are placed radial thereto so that the and the like,and a hardened binder curved surface 5, When set in motion, 'ad-Heretofore, it has been customary to form jvances to generate an aircurrent.

fan blades by molding them singly in molds Although I have described aspecific 15 of suitable curvature .and size. An abmethod of forming fanblades in accordsorbent sheet material, impregnated with a ance withmyinvention, it is obvious to binder having the characteristics offusing those skilled in the art that various changes and then hardeningunder heat, .Was formed in details of construction may be made withtothe shape of the finished blade by puncnout departing from theprinciples thereof.

20 ing or cutting, and a plurality of layers to K For instance, anysuitable fibrous material form a predetermined thickness of the may beemployed in combination with suitfinished blade were assembled in themold. able binders, or the material maybe molded Heat and pressure Werethen applied to form into a number ofshapes having the proper a unitarymass. This-method required concurvature such as curved sheets, strips,hemi 25 siderable labor and was expensive in that spheres and the like.I

it was necessary to preform the material by My method of formingcomposite fan punching, and the time consumedjin mold- 'blades embodiesdistinct improvements over ing was excessive, alarge number of extheprior art. It is simple and' efficient and pensive molds being necessaryto obtain is especially adapted for quantity produc- 30 quantityproduction.- I tion, making it of considerable commercial My inventionobviates these difficulties, importance. v it being among theobjects-thereof to form I claim as my invention: such articleseconomicallyyand quickly. 1. A method of forming composite fan a Mymethod comprises molding the mablades which comprises providing a curved35 aerial into sectionsof hollow cylinders or sheet of fibrous materialand a binder and tubes and punching out-fanblades having punching bladestherefrom.

their axesat..an angle tothe-axis of the "2. A method of formingcomposite fan curved material punched, formingthe debladeswhichcomprises provlding a curved.

sired contour offanfblade. sheet of fibrous material and a binder and 40In the accompanying drawings forming f forming blades therefrom.

a part here0f .and in, which similar refer- 3. A method of formingcomposite fan I enee characters designate similar parts, blades whichcomprises providing a tube of Fig.1 is "anend view of a hollow cylinderfibrous material and a hardened binder and or tube otmolded material, Lforming blades therefrom.

45 Fig. 2' is a plan view of a tube showing 4. A method of formingcomposite fan Ithe'position of the blades with respect to its bladeswhich comprises providing a curved axis, 4 sheet- 0f fibrous'materialand a binder and Fig. Bis a plan viewof a.fan' blade madepunching blades therefrom, said blades be- 1n accordance. with-myinventiomand ing punched with their axes at an angle to." 50. Figs. land5 are end and side views the axis of said-curved sheet material."

. thereof, respectively. p

A molded tube 1 or a section thereofsofblades which comprises providinga seption L suitable thickness formed" of fibrous maof atube of fibrousmaterial and a-blnder 'terial such as cloth, paper, and the like, andand punching blades therefrom, sa-id blades 5. A method of formingcomposite fan 1Q5 i being punched With their axes at an angle tothe axisof said tube section.-

' 6. A method. of forming composite fan blades which comprises providinga tube of fibrous material and a binder,- and punch- -ing bladestherefrom, said blades j being ,punched With their axes at an angle tothe Y axis ofsaid tube.

densation product, and punching blades therefrom, said blades beingpunched With their axes at an angle to the axis of said sheet.

8. A method of forming composite fan blades which comprises providing a.curved sheet of textile fibres and a phenolic condensation product, andpunching blades therefrom, said blades being punched with their axesatan angle to the axis of said sheet.

In testimony whereof, I have hereunto subscribed 'my name this 22nd dayof November, 1920. 3 WILLARD H. KEMPTON.

